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これまで、長さが1の単語に対しては特別な辞書ファイルを利用していた。
しかし、当初と異なり、現在は検索のdepthを制限する引数があるため、適切に調整すれば候補はそこまで増えない。
そこで、辞書検索において文字数が1の場合の例外的取り扱いを廃止した。
これにより、
p_
辞書が一部削除できるようになる。